ANT203H5 Chapter Notes - Chapter 3: Allele Frequency, Genotype Frequency, Allele
Document Summary
Problem in defining populations is determining the difference between the total census population and the breeding population (those who breed: hwe established framework to: > 1 = highest fitness fitness: organisms probability of survival and reproduction. Differences in fitness between genotypes: differences are large effect of selection is strong, strong selection allele frequencies will change fast in the population from one generation to the next. Selection is porportional reduction in fitness > selection against an allele will lead to a reduction in the allele frequency over time, selection for an allele will lead it to increase in the allele frequency over time. Balancing selection: selection for heterozygotes and against homozygotes. Stabilizing selection: slection against extreme values in a continuous trait (ex. Directional selection: selection against one extreme in a continuous trait and or selection for the other extreme. Genetic drift random occurrences that result in better survival odds or more offspring.
